Pump



Patented Jan. 23, 19.40 Y e i l l j i i alsaoos PUMP Majors.fostesucrystsl Lake, nl. n e l Application April 6, 1936, Serial No.'12,945 e, I Y s .cieirus (rtros- 116)`v 'Ihis 'invention :relates 'topumps, and among pump member I8, the bottoms 25 of the recesses otherobjects aims toprovide an inexpensive serve as camtsurfaces -to causethe plunger to pump particularly vadapted for low capacity? dewithdrawfrom the recesses. A spring 26 presses livery and for handling viscousliquids. the plunger towards the pump 4member and I 'I'he nature of theinvention maybe readily causes it to maintain engagement with the pumpunderstood by reference to one illustrative con-V member. structionembodying the invention and vs'liownvin The plunger 23 `is locatedbetween ports J5 the accompanying drawing; e and I6 andthe latter are soarranged relative l0 Fig.v l is a perspective View of the v'illustrativemember, the plungeris caused to withdraw from 10: Dump; e l onerecess'and to enter the next when the latter Figa is s longitudinal'section taken on the comes 'into resistryfwith the plunger". -lfffasplane 2-.2 of Fig. 14;- illustrated vin Fig. 4, the pump vmember be ro-Y Fig. 3 is a transverse section` taken on the {tated ina-'clockwisedirection, .the plunger will u Plane 3 3 of Fig. 2; ,l a t be causedfto' withdraw from :a recess I9 when 7,15

Fig. 4' is a view similar to'Fig. 3 but' showing` the latter is incommunication with or about to thepump in a dierent position. fcommunicate with port I5'. This action allows- The illustrative pump isdesigned for handling 'the reCeSS I9 t0 beCOme lled With lillilidfWhiChviscous liquids and for low eapaeity duty 'such' enters through port I5-If'thefarraneementbe 'cow to the plunger, that on. rotation of the pump20 as the feeding of.' oil at a predetermined 'rate 'Such that theplunger iS' Substantially Withdrawn 2/ to burners and they like, For'these services from the-recess lbefore the latter uncovers port' amongothers, ordinary pumps are not welll I5, a.vacuum will be createdlwhichon` comadapted. Their cost is high omparedto the "munic'ation with portI5lwill 'cause liquid to be service they are required to perform tandadedrawn intO .the V'liOrt- It iSA generally deSirable,-`

g5 quate control or regulation is, in' many instances, hOWeV'eiftOdesign the deViC'e SO that ilvithdyralivall 25, i

unsatisfactory. The illustrative pum'p'is not only ef theplunger Occursentirely While the recess extremely inexpensive but it is reliable and`ca in 00min-unicamon With the inlet- DOii'- iThiS' pable of preciseregulation and control. v.avoids the''possibility of air leakage intothe As here shown, the pump comprises a @elsing recess (as might be thecase if'fa partial vacuum l0 I0 having an inlet passage .Il and an`outlet were'Createdlinhthe recess) and avoids the ne- 30' passage I2.Connected to therrespetiv'le,pis7 cessity for extremely closemanufacturing toler-v sages are pipes or other app'lofpriatek conduitsahCeS- `The rotary, Dump member Should have -a I3 and I4 whchconvey1iquid torn@ pump andv running-nt with its'casing which is suflicient toi f conduct the same therefromv `to iliepoint' of .prevent leakage offluid between the ports." u delivery. The passagesiliandlrterrriinstein" Whether the withdrawal 'of the plunger occurs 35 ports l5 and I6respectively in a. cylindrical eheuri- Wholly 0r partly befre'Communication with leert ber II within thel casing I0. *'RotatableWithin A I5, the result in. eithercase willbethatfthe'` Chamber I1 is acylindrical pump rremberf I3v recessv I9 willibe iilled with liquid.Further ro-=v which ms the chgmmerv and :i5-,provided with a tatiorlof'th'eipump membercarries the iilled ree a) plurality of recesses orpockets I9, Wliichfllflonl .Cess iiitojcommuniC-atifih With Dort l5, atWhich rotation of the pumpmember,y succesg'i'vlycom.' time 'the-plunger23 enters the recess displacing Y municate with the inlet andoutlet-ports I5 and an eflnalveliiine ef liquid ihlOilgh 'pt I6. The I6.The pockets are here shown in the fgrm of maximllnrdis'placem'ent shouldoccur before vthe transverse slots which are out or otherwise recess I9wholly leaves port I6. The amount vo'f formed in the cylindrical body ofthe pump memlie-nid thus displaced deDendS UDCH-the extent t0 45 ber I8.One end, at least, of the pump member which the plunger entersy therecessl I 9; Other reprojects from the casing I0 and is provided withCeSSeS paSS through the Same CYCle- The number driving means such as agear 0r pulley 20, A and size of therecesses obviously maybe varied.siuiing box 2l and packing 'gland 22 -seal the TWO are Shown in thepresent instance.

50 pump member against escape of liquid fromthe In the Present designwherein the DONS 216250 chamber. opposite and the plunger midway betweenthem, Cooperating with the recesses I9 is a plunger the end `24 of theplunger is oppositely beveled as 23 whose extremity 24 is adapted toenter and at 21 S0 that movement of the plunger in a re-` Withdraw fromthe recesses I9, In the present cess occurs only while the recess isincommuni-f Il instance, plunger 23 is reciprocated by'therotary GatienWith its PONL i' A nne adjustment oi the output of the pump may beeffected by adjusting the forward limit of travel of plunger 23. In thepresent instance, the outer extremity 28 of the plunger is screwthreadedand provided with a nut 29 whose engagement with the casing limits theextent to which the plunger enters the recess. Nut 29 is preferably ofthe castle ornotched variety and is engaged by the extremity of spring26, which therefore serves to prevent accidental rotation of the nut.The spring also extends through a notch in the plunger to hold itagainst rotation. Rough adjustment of the pump delivery may be made byvarying the speed of rotation of the pump member.

'I'he pump may be advantageously used to handle viscous and stickyliquids since the ports, passages, and recess I9 may be made largerwithout altering the design or decreasing its reliability or theregularity of feed. Withdrawing of the liquid is therefore avoided.

If desired, the pump member may be elongated (as shown), and a pluralityof sets of ports and plungers may be employed which, if desired, mayeach be independent, thus combining in one apparatus a plurality ofpumps each of which may be independently adjusted and if desired,connected to different sources of supply and points of delivery.

If the aforesaid plurality of sets of ports are n connected together,preferably the recesses and plungers should be arranged to operate indifferent phases so that all do not deliver at one instant. Obviously,the rate of delivery may be made very small. Yet small thoughit is, thedelivery will, nevertheless. be reliable and uniform. Wide variation inrate of delivery may be secured (even without stoppingthe pump) simplyby rotating the adjusting nut 29to vary the extent to which 'the plungeris permitted to enter the recesses and therefore to vary the amount ofliquid displaced at each cycle. The plunger and recesssatisfactorilyprevent longitudinal movement Vof the rotary pump member, and the casingl0 may therefore 'be closed at one end. -The pump may be made l. Avariable delivery liquidpump of thefcharacter described comprising incombination a casing having a cylindrical bore providedwith inlet andoutlet ports, a cylindrical rotary device in said bore having a liquidchamber in its cylindrical surface rotatable in succession past saidinlet and outlet ports, a reciprocal plunger carried by said casingbetween` said ports and in registry with the path of said chamber andmovable intesaid chamber and operable only on its outward movement tocause liquid to enter said chamber and only on its inward movement todisplace fluid therefrom, the cylindrical surface of said boresurrounding said plunger being unbroken so as to confine the liquidchamber to said rotary device, said plunger being smaller "n transversesection than that of said chamber to provide clearance betweenthe-plunger and the sides of said chamber, the surface ofthe bottom ofsaid chamber and the bottom surface of said plunger beingshaped so asnot to cam said plunger out of the chamber before the latter has comeinto communication with the inlet port, and means for moving saidplunger into said chamber as the latter `cornes into'communication withsaid outlet port.

2. A liquidpump of the character described comprising in' combination acasing provided with a bore therein having inlet and outlet'ports,

a rotary cylindrical device mounted in said bore and having a chamber inits cylindrical surface `rotatable in succession pastsaid inlet and`out- `chamber periodically movable into said chamber only when thelatter is in communication with the outlet port, the cylindrical surfaceof said rbore surrounding the plunger beingv unbroken sov as to confinethe liquid chamber to said rotary cylindrical device and means formoving said member vinto said chamber to displace fluid therefromdirectly into the outlet port, said recess having a surface designed toonly move said member out of said recess for filling said recess whenthe latter is in communication with said inlet port.

K 3. A metering liquidpump'of-the character del I scribed comprising incombination' a-casing having a bore therein and having inlet' and'outlet ports, a. rotary member mounted in said bore and' having achamber therein movable in succession across said ports, a volumedisplacing plunger between Isaid ports and in registry with the path ofsaid chamber and movable into said chamber only while the latter is incommunication with said outlet port to displace fluid from said chamberdirectly into said outlet port, the cylindrical surface of said' boresurrounding said plunger being unbroken so as to confine the liquidchamber tosaid rotary member said chamber having a surface designed tocamy saidplunger out of` the chamber only while said chamber is incommunication with said inlet port upon continued rotation ofsaid-membenand'means for adjusting the extent to which said plungerenters said chamber to vary the delivery of said pump.

MAJOR E. GATES.

